1. The cold water pump of the thermal transfer laser marking machine is worn, which leads to the aging of the water pump and needs to be replaced;
2. The power supply voltage of the water cooler of the thermal transfer laser marking machine is insufficient, and the output voltage of the DC pump is generally between 22V and 24V. If it is lower than this value, the power supply needs to be replaced, and the AC motor needs a voltage stabilizer or the power supply line of the water cooler needs rectification (aging will also lead to this problem);
There are impurities in the water pump, which need to be cleaned.